Use both the '$$cov_*' and istanbul's default __coverage__ var to see if istanbul is running
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Currently it's only looking for the $$cov_ global variable to know if istanbul is running. If you use istanbul programmatically, it doesn't instantiate $$cov_ but uses the default
__coverage__var. (see https://github.com/gotwarlost/istanbul/blob/master/lib/instrumenter.js#L340) A great example of using istanbul programatically is https://www.npmjs.org/package/gulp-istanbul.